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CVE-2025-13427

Authentication Bypass in Dialogflow CX Messenger

MEDIUM
6.9
CVSS Score
Published: December 18, 2025 at 09:57 PM UTC
Updated: September 30, 2026 at 04:10 PM UTC
1 product affected across 1 vendorDialogflow CX

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

An authentication bypass vulnerability in Google Cloud Dialogflow CX Messenger allowed unauthenticated users to interact with restricted chat agents, gaining access to the agents' knowledge and the ability to trigger their intents, by manipulating initialization parameters or crafting specific API requests. All versions after August 20th, 2025 have been updated to protect from this vulnerability. No user action is required for this.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Dialogflow CX· Google Cloud
60%
v ≤ 2025-08-20

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Release Notes
Source: cverecord
https://docs.cloud.google.com/dialogflow/docs/release-notes#December_11_2025

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMGoogleCloud
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-287

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